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The HKS MK-3A is a straightforward tool that does one job exceptionally well: getting all six cartridges into your revolver quickly and reliably. Made in the USA, this A-Series speedloader pairs a black polymer body with a knurled aluminum release knob that's easy to grip under any conditions. The metal cam points hold your rounds firmly in place with zero cartridge jiggle, meaning they stay secure until the moment you twist the knob to release them into the cylinder.
The mechanism is simple and proven. Load your six rounds into the chambers of the speedloader, align it with your open cylinder, and push down firmly. Give the knob a slight twist and the rounds drop into the cylinder. The whole process beats single-loading by a considerable margin, which makes a real difference during practice sessions or when you need to reload quickly at the range. The design doesn't require springs or complicated mechanics to malfunction, which is why law enforcement agencies have issued them for decades.
This loader fits Colt MK III and MK V revolvers, King Cobra models, Peacekeeper, and Ruger Security Six variants. Be aware that newer King Cobra designs with different grip geometries may have fitment issues. The compact footprint (6.2 inches long) means the loader won't interfere with standard grips on compatible revolvers, though some oversized or custom grips can create clearance problems. Checking compatibility with your specific gun is worth a few minutes before purchase.
With proper care, this speedloader will outlast most of the revolvers you'll use it with. The metal cam points and aluminum knob stand up to regular range use without degradation. Like any precision tool, it performs best when kept reasonably clean and dry. You're looking at a one-time investment that pays dividends every range trip.
The MK-3A works well with original King Cobra models from the 1980s and 1990s. However, newer King Cobra designs have different cylinder and grip geometries that can interfere with proper seating. Check your specific model before ordering, or contact HKS directly to confirm compatibility.
The MK-3A loads all six rounds at once with a single twist, whereas speed strips require loading rounds one or two at a time. Most users report significantly faster reloads with the speedloader, though it does require a short learning curve to get smooth with the motion. The time difference becomes more noticeable when you're doing multiple reloads during a range session.
Yes. The MK-3A is designed for both calibers and works reliably with either. Since .357 rounds are slightly longer than .38 Special, make sure your revolver has enough cylinder depth to accommodate whichever round you're loading.
Some revolvers with oversized or custom grips can interfere with the speedloader's alignment. If the loader doesn't seat fully into the cylinder, the grip may need adjustment or replacement. Additionally, some newer revolver models have modified cylinder releases or geometry that HKS hadn't accounted for when designing this loader. Contact HKS or try the loader at a range to test fit before fully committing.
| UPC | 088652001118 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MK3A |
| Brand Fit | Slide |
| Caliber/Gauge | .357 Magnum |
| Capacity | 6 |
| Color | Black |
| Length | 6.2000 |
| Model | |
| Product Type | Speedloader |
| Shipping Weight | 0.0688 |
| Style | Competition |
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